Expanding reamer



f (No Model.)

\ VP. GBNDRO'N.

EXBANDING BEAMER. n

` Patented Nov. 27, 188s.

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man? l UNITED STATESPATENT Ormes..

PETERGENDRON, OF TOLEDO, OHIO.`

EXPANDING REAMER.`

SPECIFICATION .forming part of Letters Patent No. 289,248, datedNovember 27, 1883.

Application filed Janna `l'o @ZZ whom, zit may concern:

Be it known that I, PETER GENDRO, of

Toledo, in the county .of Lucas and State of exact description thereof,reference being had to the accompanying drawings, which form a part ofthis specification.

This invention relates to certain new and i useful improvements in theconstruction of expanding reamers; and the invention consists in thepeculiar construction and arrangement ofthe knives or cutters within thehead andthe `means employed for securing them in their adjustablepositions, all as more fully hereinafter set forth.

`Figure l is a central vertical longitudinal section through my improveddevice, and Fig. 2 is a cross-section of the same.

`In the accompanying drawings, A represents the shank, which is providedwith the enlarged head B, and with the threaded stud C at the outer end.

D represents the cutters, which are` de signed to it snugly inlongitudinal inclined channels cut in the periphery of ther head B, theknives gradually increasing in thickness from point to heel, withparallel sides, While their inner ends are beveled off and enter thecollar or sleeve E, which slips over the shank and is retained in itsproper position by the nut F,` which is screwed upon the shank, thelatter being threaded for that purpose. Upon the outer and threaded end,C, of the shank, I secure a supporting-nut, G, and the nut I-I. "Ihe`inner face of this `nut-H is slightly conically recessed, and has formedin it the radial channels a, which are brought coincident with thelongitudinal channels in the head, and are designed to receive the outeror toe end ofthe cutters, which' are slightly beveled or chamfered 0E,so'that they will fit snugly into such recesses or channels a. Inpractice, when the cutters are retracted so as to perform their functionwithin their smallest diameter, the

greater portion of them is retained within the channels in the head,being securelylocked to place at toe andheel by the collar E and ry 22,1833. (No model.)

nut F at one end and the nut H at the outer end.

It has been found in expanding reamers where the cutters are projectedbeyond a certain distance from the head there is no support for theouter or toe end'of the cutters, and hen ce they very often break. In mydevice, when the cutters are projected from the head to any extent, asupporting-nut is so adj usted that the outer ends of the cutters willrest upon the periphery of such nut, while the channels in to place andprevent any giving from the work. By the use of the tapered channels andcutters of corresponding taper the b0ttoms of the channels form a firmsupport for the backs of the cutters under all changes in position, andby making the stock or shank and the ribs in one piece, so as to makesaid ribs solid with the stock at the bottoms of the channels, there isno liability of said ribs being broken off by the side strain to whichthey are subjected when in use, whereas if the shank or stock were madesolid, with a tapering base sliding therein, as has heretofore beenproposed, the ribs are only connected to each other at the top "andbottom, and are thus easily broken.

I am aware of the Patents Nos. 71,339, 111,296, and 252,903, and make noclaim to anything shown therein.

What I claim as my invention is 1. In an expanding reamer, the combination, with the cutter-stock, consisting of the stock A and head B,having a series of ribs formed thereon, said stock, head, and ribs beingin one piece, and the ribs forming radiating channels tapering from endto end, of a series of tapering cutters resting on the bottom of saidchannels, and means, substantially as described, for securing both endso said cutters to the head, as set forth.

2. Inan eypandiug reamer, t-he combination, with the cutterstock,consisting of the stock A and head B, the latter having alseries of ribsformed integral therewith and radiating therefrom, forming channelstaperin from end to end, of the nut F, collar l, tapering cutters D,resting on the bottom of said the face of the nut H hold the cuttersrigidly 2 :reggere channels, and dished nut H, substantially aschannels, collar or sleeve E, nut F,-support described.

3. In an expanding reamer the outter-stock of Which consists of theshank A and head 5 B, the latter vhaving a series of ribs formedintegral therewith and radiating therefrom, forming:r channels taperingfrom end to end, taper cutters D, resting on the bottom of said ing-nutG, and retaining-nut H,a11 constructed, 1o arranged, and operatingsubstantially as and for the purpose set forth.

P. GENDRON.

Witnesses:

H. S. SPRAGUE, E. SCULLY.

